1 //===- ELFObjectFile.cpp - ELF object file implementation -------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines the ELFObjectFile class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ADT/SmallVector.h" 15 #include "llvm/ADT/StringSwitch.h" 16 #include "llvm/ADT/Triple.h" 17 #include "llvm/ADT/DenseMap.h" 18 #include "llvm/Object/ObjectFile.h" 19 #include "llvm/Support/ELF.h" 20 #include "llvm/Support/Endian.h" 21 #include "llvm/Support/ErrorHandling.h" 22 #include "llvm/Support/MemoryBuffer.h" 23 #include "llvm/Support/raw_ostream.h" 24 #include <algorithm> 25 #include <limits> 26 #include <utility> 27 28 using namespace llvm; 29 using namespace object; 30 31 // Templates to choose Elf_Addr and Elf_Off depending on is64Bits. 32 namespace { 33 template<support::endianness target_endianness> 34 struct ELFDataTypeTypedefHelperCommon { 35 typedef support::detail::packed_endian_specific_integral 36 <uint16_t, target_endianness, support::aligned> Elf_Half; 37 typedef support::detail::packed_endian_specific_integral 38 <uint32_t, target_endianness, support::aligned> Elf_Word; 39 typedef support::detail::packed_endian_specific_integral 40 <int32_t, target_endianness, support::aligned> Elf_Sword; 41 typedef support::detail::packed_endian_specific_integral 42 <uint64_t, target_endianness, support::aligned> Elf_Xword; 43 typedef support::detail::packed_endian_specific_integral 44 <int64_t, target_endianness, support::aligned> Elf_Sxword; 45 }; 46 } 47 48 namespace { 49 template<support::endianness target_endianness, bool is64Bits> 50 struct ELFDataTypeTypedefHelper; 51 52 /// ELF 32bit types. 53 template<support::endianness target_endianness> 54 struct ELFDataTypeTypedefHelper<target_endianness, false> 55 : ELFDataTypeTypedefHelperCommon<target_endianness> { 56 typedef support::detail::packed_endian_specific_integral 57 <uint32_t, target_endianness, support::aligned> Elf_Addr; 58 typedef support::detail::packed_endian_specific_integral 59 <uint32_t, target_endianness, support::aligned> Elf_Off; 60 }; 61 62 /// ELF 64bit types. 63 template<support::endianness target_endianness> 64 struct ELFDataTypeTypedefHelper<target_endianness, true> 65 : ELFDataTypeTypedefHelperCommon<target_endianness>{ 66 typedef support::detail::packed_endian_specific_integral 67 <uint64_t, target_endianness, support::aligned> Elf_Addr; 68 typedef support::detail::packed_endian_specific_integral 69 <uint64_t, target_endianness, support::aligned> Elf_Off; 70 }; 71 } 72 73 // I really don't like doing this, but the alternative is copypasta. 74 #define LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) \ 75 typedef typename \ 76 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Addr Elf_Addr; \ 77 typedef typename \ 78 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Off Elf_Off; \ 79 typedef typename \ 80 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Half Elf_Half; \ 81 typedef typename \ 82 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Word Elf_Word; \ 83 typedef typename \ 84 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sword Elf_Sword; \ 85 typedef typename \ 86 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Xword Elf_Xword; \ 87 typedef typename \ 88 ELFDataTypeTypedefHelper<target_endianness, is64Bits>::Elf_Sxword Elf_Sxword; 89 90 // Section header. 91 namespace { 92 template<support::endianness target_endianness, bool is64Bits> 93 struct Elf_Shdr_Base; 94 95 template<support::endianness target_endianness> 96 struct Elf_Shdr_Base<target_endianness, false> { 97 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 98 Elf_Word sh_name; // Section name (index into string table) 99 Elf_Word sh_type; // Section type (SHT_*) 100 Elf_Word sh_flags; // Section flags (SHF_*) 101 Elf_Addr sh_addr; // Address where section is to be loaded 102 Elf_Off sh_offset; // File offset of section data, in bytes 103 Elf_Word sh_size; // Size of section, in bytes 104 Elf_Word sh_link; // Section type-specific header table index link 105 Elf_Word sh_info; // Section type-specific extra information 106 Elf_Word sh_addralign;// Section address alignment 107 Elf_Word sh_entsize; // Size of records contained within the section 108 }; 109 110 template<support::endianness target_endianness> 111 struct Elf_Shdr_Base<target_endianness, true> { 112 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 113 Elf_Word sh_name; // Section name (index into string table) 114 Elf_Word sh_type; // Section type (SHT_*) 115 Elf_Xword sh_flags; // Section flags (SHF_*) 116 Elf_Addr sh_addr; // Address where section is to be loaded 117 Elf_Off sh_offset; // File offset of section data, in bytes 118 Elf_Xword sh_size; // Size of section, in bytes 119 Elf_Word sh_link; // Section type-specific header table index link 120 Elf_Word sh_info; // Section type-specific extra information 121 Elf_Xword sh_addralign;// Section address alignment 122 Elf_Xword sh_entsize; // Size of records contained within the section 123 }; 124 125 template<support::endianness target_endianness, bool is64Bits> 126 struct Elf_Shdr_Impl : Elf_Shdr_Base<target_endianness, is64Bits> { 127 using Elf_Shdr_Base<target_endianness, is64Bits>::sh_entsize; 128 using Elf_Shdr_Base<target_endianness, is64Bits>::sh_size; 129 130 /// @brief Get the number of entities this section contains if it has any. 131 unsigned getEntityCount() const { 132 if (sh_entsize == 0) 133 return 0; 134 return sh_size / sh_entsize; 135 } 136 }; 137 } 138 139 namespace { 140 template<support::endianness target_endianness, bool is64Bits> 141 struct Elf_Sym_Base; 142 143 template<support::endianness target_endianness> 144 struct Elf_Sym_Base<target_endianness, false> { 145 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 146 Elf_Word st_name; // Symbol name (index into string table) 147 Elf_Addr st_value; // Value or address associated with the symbol 148 Elf_Word st_size; // Size of the symbol 149 unsigned char st_info; // Symbol's type and binding attributes 150 unsigned char st_other; // Must be zero; reserved 151 Elf_Half st_shndx; // Which section (header table index) it's defined in 152 }; 153 154 template<support::endianness target_endianness> 155 struct Elf_Sym_Base<target_endianness, true> { 156 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 157 Elf_Word st_name; // Symbol name (index into string table) 158 unsigned char st_info; // Symbol's type and binding attributes 159 unsigned char st_other; // Must be zero; reserved 160 Elf_Half st_shndx; // Which section (header table index) it's defined in 161 Elf_Addr st_value; // Value or address associated with the symbol 162 Elf_Xword st_size; // Size of the symbol 163 }; 164 165 template<support::endianness target_endianness, bool is64Bits> 166 struct Elf_Sym_Impl : Elf_Sym_Base<target_endianness, is64Bits> { 167 using Elf_Sym_Base<target_endianness, is64Bits>::st_info; 168 169 // These accessors and mutators correspond to the ELF32_ST_BIND, 170 // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification: 171 unsigned char getBinding() const { return st_info >> 4; } 172 unsigned char getType() const { return st_info & 0x0f; } 173 void setBinding(unsigned char b) { setBindingAndType(b, getType()); } 174 void setType(unsigned char t) { setBindingAndType(getBinding(), t); } 175 void setBindingAndType(unsigned char b, unsigned char t) { 176 st_info = (b << 4) + (t & 0x0f); 177 } 178 }; 179 } 180 181 namespace { 182 template<support::endianness target_endianness, bool is64Bits, bool isRela> 183 struct Elf_Rel_Base; 184 185 template<support::endianness target_endianness> 186 struct Elf_Rel_Base<target_endianness, false, false> { 187 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 188 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 189 Elf_Word r_info; // Symbol table index and type of relocation to apply 190 }; 191 192 template<support::endianness target_endianness> 193 struct Elf_Rel_Base<target_endianness, true, false> { 194 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 195 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 196 Elf_Xword r_info; // Symbol table index and type of relocation to apply 197 }; 198 199 template<support::endianness target_endianness> 200 struct Elf_Rel_Base<target_endianness, false, true> { 201 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 202 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 203 Elf_Word r_info; // Symbol table index and type of relocation to apply 204 Elf_Sword r_addend; // Compute value for relocatable field by adding this 205 }; 206 207 template<support::endianness target_endianness> 208 struct Elf_Rel_Base<target_endianness, true, true> { 209 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 210 Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) 211 Elf_Xword r_info; // Symbol table index and type of relocation to apply 212 Elf_Sxword r_addend; // Compute value for relocatable field by adding this. 213 }; 214 215 template<support::endianness target_endianness, bool is64Bits, bool isRela> 216 struct Elf_Rel_Impl; 217 218 template<support::endianness target_endianness, bool isRela> 219 struct Elf_Rel_Impl<target_endianness, true, isRela> 220 : Elf_Rel_Base<target_endianness, true, isRela> { 221 using Elf_Rel_Base<target_endianness, true, isRela>::r_info; 222 LLVM_ELF_IMPORT_TYPES(target_endianness, true) 223 224 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE, 225 // and ELF64_R_INFO macros defined in the ELF specification: 226 uint64_t getSymbol() const { return (r_info >> 32); } 227 unsigned char getType() const { 228 return (unsigned char) (r_info & 0xffffffffL); 229 } 230 void setSymbol(uint64_t s) { setSymbolAndType(s, getType()); } 231 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 232 void setSymbolAndType(uint64_t s, unsigned char t) { 233 r_info = (s << 32) + (t&0xffffffffL); 234 } 235 }; 236 237 template<support::endianness target_endianness, bool isRela> 238 struct Elf_Rel_Impl<target_endianness, false, isRela> 239 : Elf_Rel_Base<target_endianness, false, isRela> { 240 using Elf_Rel_Base<target_endianness, false, isRela>::r_info; 241 LLVM_ELF_IMPORT_TYPES(target_endianness, false) 242 243 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE, 244 // and ELF32_R_INFO macros defined in the ELF specification: 245 uint32_t getSymbol() const { return (r_info >> 8); } 246 unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); } 247 void setSymbol(uint32_t s) { setSymbolAndType(s, getType()); } 248 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 249 void setSymbolAndType(uint32_t s, unsigned char t) { 250 r_info = (s << 8) + t; 251 } 252 }; 253 254 } 255 256 namespace { 257 template<support::endianness target_endianness, bool is64Bits> 258 class ELFObjectFile : public ObjectFile { 259 LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits) 260 261 typedef Elf_Shdr_Impl<target_endianness, is64Bits> Elf_Shdr; 262 typedef Elf_Sym_Impl<target_endianness, is64Bits> Elf_Sym; 263 typedef Elf_Rel_Impl<target_endianness, is64Bits, false> Elf_Rel; 264 typedef Elf_Rel_Impl<target_endianness, is64Bits, true> Elf_Rela; 265 266 struct Elf_Ehdr { 267 unsigned char e_ident[ELF::EI_NIDENT]; // ELF Identification bytes 268 Elf_Half e_type; // Type of file (see ET_*) 269 Elf_Half e_machine; // Required architecture for this file (see EM_*) 270 Elf_Word e_version; // Must be equal to 1 271 Elf_Addr e_entry; // Address to jump to in order to start program 272 Elf_Off e_phoff; // Program header table's file offset, in bytes 273 Elf_Off e_shoff; // Section header table's file offset, in bytes 274 Elf_Word e_flags; // Processor-specific flags 275 Elf_Half e_ehsize; // Size of ELF header, in bytes 276 Elf_Half e_phentsize;// Size of an entry in the program header table 277 Elf_Half e_phnum; // Number of entries in the program header table 278 Elf_Half e_shentsize;// Size of an entry in the section header table 279 Elf_Half e_shnum; // Number of entries in the section header table 280 Elf_Half e_shstrndx; // Section header table index of section name 281 // string table 282 bool checkMagic() const { 283 return (memcmp(e_ident, ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0; 284 } 285 unsigned char getFileClass() const { return e_ident[ELF::EI_CLASS]; } 286 unsigned char getDataEncoding() const { return e_ident[ELF::EI_DATA]; } 287 }; 288 289 typedef SmallVector<const Elf_Shdr*, 1> Sections_t; 290 typedef DenseMap<unsigned, unsigned> IndexMap_t; 291 typedef DenseMap<const Elf_Shdr*, SmallVector<uint32_t, 1> > RelocMap_t; 292 293 const Elf_Ehdr *Header; 294 const Elf_Shdr *SectionHeaderTable; 295 const Elf_Shdr *dot_shstrtab_sec; // Section header string table. 296 const Elf_Shdr *dot_strtab_sec; // Symbol header string table. 297 Sections_t SymbolTableSections; 298 IndexMap_t SymbolTableSectionsIndexMap; 299 DenseMap<const Elf_Sym*, Elf_Word> ExtendedSymbolTable; 300 301 /// @brief Map sections to an array of relocation sections that reference 302 /// them sorted by section index. 303 RelocMap_t SectionRelocMap; 304 305 /// @brief Get the relocation section that contains \a Rel. 306 const Elf_Shdr *getRelSection(DataRefImpl Rel) const { 307 return getSection(Rel.w.b); 308 } 309 310 void validateSymbol(DataRefImpl Symb) const; 311 bool isRelocationHasAddend(DataRefImpl Rel) const; 312 template<typename T> 313 const T *getEntry(uint16_t Section, uint32_t Entry) const; 314 template<typename T> 315 const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const; 316 const Elf_Sym *getSymbol(DataRefImpl Symb) const; 317 const Elf_Shdr *getSection(DataRefImpl index) const; 318 const Elf_Shdr *getSection(uint32_t index) const; 319 const Elf_Rel *getRel(DataRefImpl Rel) const; 320 const Elf_Rela *getRela(DataRefImpl Rela) const; 321 const char *getString(uint32_t section, uint32_t offset) const; 322 const char *getString(const Elf_Shdr *section, uint32_t offset) const; 323 error_code getSymbolName(const Elf_Sym *Symb, StringRef &Res) const; 324 325 protected: 326 virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const; 327 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const; 328 virtual error_code getSymbolOffset(DataRefImpl Symb, uint64_t &Res) const; 329 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const; 330 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const; 331 virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const; 332 virtual error_code isSymbolInternal(DataRefImpl Symb, bool &Res) const; 333 virtual error_code isSymbolGlobal(DataRefImpl Symb, bool &Res) const; 334 virtual error_code getSymbolType(DataRefImpl Symb, SymbolRef::SymbolType &Res) const; 335 336 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const; 337 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const; 338 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const; 339 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const; 340 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const; 341 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const; 342 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const; 343 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const; 344 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const; 345 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb, 346 bool &Result) const; 347 virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const; 348 virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const; 349 350 virtual error_code getRelocationNext(DataRefImpl Rel, 351 RelocationRef &Res) const; 352 virtual error_code getRelocationAddress(DataRefImpl Rel, 353 uint64_t &Res) const; 354 virtual error_code getRelocationSymbol(DataRefImpl Rel, 355 SymbolRef &Res) const; 356 virtual error_code getRelocationType(DataRefImpl Rel, 357 uint32_t &Res) const; 358 virtual error_code getRelocationTypeName(DataRefImpl Rel, 359 SmallVectorImpl<char> &Result) const; 360 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel, 361 int64_t &Res) const; 362 virtual error_code getRelocationValueString(DataRefImpl Rel, 363 SmallVectorImpl<char> &Result) const; 364 365 public: 366 ELFObjectFile(MemoryBuffer *Object, error_code &ec); 367 virtual symbol_iterator begin_symbols() const; 368 virtual symbol_iterator end_symbols() const; 369 virtual section_iterator begin_sections() const; 370 virtual section_iterator end_sections() const; 371 372 virtual uint8_t getBytesInAddress() const; 373 virtual StringRef getFileFormatName() const; 374 virtual unsigned getArch() const; 375 376 uint64_t getNumSections() const; 377 uint64_t getStringTableIndex() const; 378 uint64_t getSymbolTableIndex(const Elf_Sym *symb) const; 379 const Elf_Shdr *getSection(const Elf_Sym *symb) const; 380 }; 381 } // end namespace 382 383 template<support::endianness target_endianness, bool is64Bits> 384 void ELFObjectFile<target_endianness, is64Bits> 385 ::validateSymbol(DataRefImpl Symb) const { 386 const Elf_Sym *symb = getSymbol(Symb); 387 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; 388 // FIXME: We really need to do proper error handling in the case of an invalid 389 // input file. Because we don't use exceptions, I think we'll just pass 390 // an error object around. 391 if (!( symb 392 && SymbolTableSection 393 && symb >= (const Elf_Sym*)(base() 394 + SymbolTableSection->sh_offset) 395 && symb < (const Elf_Sym*)(base() 396 + SymbolTableSection->sh_offset 397 + SymbolTableSection->sh_size))) 398 // FIXME: Proper error handling. 399 report_fatal_error("Symb must point to a valid symbol!"); 400 } 401 402 template<support::endianness target_endianness, bool is64Bits> 403 error_code ELFObjectFile<target_endianness, is64Bits> 404 ::getSymbolNext(DataRefImpl Symb, 405 SymbolRef &Result) const { 406 validateSymbol(Symb); 407 const Elf_Shdr *SymbolTableSection = SymbolTableSections[Symb.d.b]; 408 409 ++Symb.d.a; 410 // Check to see if we are at the end of this symbol table. 411 if (Symb.d.a >= SymbolTableSection->getEntityCount()) { 412 // We are at the end. If there are other symbol tables, jump to them. 413 ++Symb.d.b; 414 Symb.d.a = 1; // The 0th symbol in ELF is fake. 415 // Otherwise return the terminator. 416 if (Symb.d.b >= SymbolTableSections.size()) { 417 Symb.d.a = std::numeric_limits<uint32_t>::max(); 418 Symb.d.b = std::numeric_limits<uint32_t>::max(); 419 } 420 } 421 422 Result = SymbolRef(Symb, this); 423 return object_error::success; 424 } 425 426 template<support::endianness target_endianness, bool is64Bits> 427 error_code ELFObjectFile<target_endianness, is64Bits> 428 ::getSymbolName(DataRefImpl Symb, 429 StringRef &Result) const { 430 validateSymbol(Symb); 431 const Elf_Sym *symb = getSymbol(Symb); 432 return getSymbolName(symb, Result); 433 } 434 435 template<support::endianness target_endianness, bool is64Bits> 436 uint64_t ELFObjectFile<target_endianness, is64Bits> 437 ::getSymbolTableIndex(const Elf_Sym *symb) const { 438 if (symb->st_shndx == ELF::SHN_XINDEX) 439 return ExtendedSymbolTable.lookup(symb); 440 return symb->st_shndx; 441 } 442 443 template<support::endianness target_endianness, bool is64Bits> 444 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 445 ELFObjectFile<target_endianness, is64Bits> 446 ::getSection(const Elf_Sym *symb) const { 447 if (symb->st_shndx == ELF::SHN_XINDEX) { 448 if (!ExtendedSymbolTable.count(symb)) 449 return 0; 450 return getSection(ExtendedSymbolTable.lookup(symb)); 451 } 452 if (symb->st_shndx >= ELF::SHN_LORESERVE) 453 return 0; 454 return getSection(symb->st_shndx); 455 } 456 457 template<support::endianness target_endianness, bool is64Bits> 458 error_code ELFObjectFile<target_endianness, is64Bits> 459 ::getSymbolOffset(DataRefImpl Symb, 460 uint64_t &Result) const { 461 validateSymbol(Symb); 462 const Elf_Sym *symb = getSymbol(Symb); 463 const Elf_Shdr *Section; 464 switch (getSymbolTableIndex(symb)) { 465 case ELF::SHN_COMMON: 466 // Undefined symbols have no address yet. 467 case ELF::SHN_UNDEF: 468 Result = UnknownAddressOrSize; 469 return object_error::success; 470 case ELF::SHN_ABS: 471 Result = symb->st_value; 472 return object_error::success; 473 default: Section = getSection(symb); 474 } 475 476 switch (symb->getType()) { 477 case ELF::STT_SECTION: 478 Result = Section ? Section->sh_addr : UnknownAddressOrSize; 479 return object_error::success; 480 case ELF::STT_FUNC: 481 case ELF::STT_OBJECT: 482 case ELF::STT_NOTYPE: 483 Result = symb->st_value; 484 return object_error::success; 485 default: 486 Result = UnknownAddressOrSize; 487 return object_error::success; 488 } 489 } 490 491 template<support::endianness target_endianness, bool is64Bits> 492 error_code ELFObjectFile<target_endianness, is64Bits> 493 ::getSymbolAddress(DataRefImpl Symb, 494 uint64_t &Result) const { 495 validateSymbol(Symb); 496 const Elf_Sym *symb = getSymbol(Symb); 497 const Elf_Shdr *Section; 498 switch (getSymbolTableIndex(symb)) { 499 case ELF::SHN_COMMON: // Fall through. 500 // Undefined symbols have no address yet. 501 case ELF::SHN_UNDEF: 502 Result = UnknownAddressOrSize; 503 return object_error::success; 504 case ELF::SHN_ABS: 505 Result = reinterpret_cast<uintptr_t>(base()+symb->st_value); 506 return object_error::success; 507 default: Section = getSection(symb); 508 } 509 const uint8_t* addr = base(); 510 if (Section) 511 addr += Section->sh_offset; 512 switch (symb->getType()) { 513 case ELF::STT_SECTION: 514 Result = reinterpret_cast<uintptr_t>(addr); 515 return object_error::success; 516 case ELF::STT_FUNC: // Fall through. 517 case ELF::STT_OBJECT: // Fall through. 518 case ELF::STT_NOTYPE: 519 addr += symb->st_value; 520 Result = reinterpret_cast<uintptr_t>(addr); 521 return object_error::success; 522 default: 523 Result = UnknownAddressOrSize; 524 return object_error::success; 525 } 526 } 527 528 template<support::endianness target_endianness, bool is64Bits> 529 error_code ELFObjectFile<target_endianness, is64Bits> 530 ::getSymbolSize(DataRefImpl Symb, 531 uint64_t &Result) const { 532 validateSymbol(Symb); 533 const Elf_Sym *symb = getSymbol(Symb); 534 if (symb->st_size == 0) 535 Result = UnknownAddressOrSize; 536 Result = symb->st_size; 537 return object_error::success; 538 } 539 540 template<support::endianness target_endianness, bool is64Bits> 541 error_code ELFObjectFile<target_endianness, is64Bits> 542 ::getSymbolNMTypeChar(DataRefImpl Symb, 543 char &Result) const { 544 validateSymbol(Symb); 545 const Elf_Sym *symb = getSymbol(Symb); 546 const Elf_Shdr *Section = getSection(symb); 547 548 char ret = '?'; 549 550 if (Section) { 551 switch (Section->sh_type) { 552 case ELF::SHT_PROGBITS: 553 case ELF::SHT_DYNAMIC: 554 switch (Section->sh_flags) { 555 case (ELF::SHF_ALLOC | ELF::SHF_EXECINSTR): 556 ret = 't'; break; 557 case (ELF::SHF_ALLOC | ELF::SHF_WRITE): 558 ret = 'd'; break; 559 case ELF::SHF_ALLOC: 560 case (ELF::SHF_ALLOC | ELF::SHF_MERGE): 561 case (ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS): 562 ret = 'r'; break; 563 } 564 break; 565 case ELF::SHT_NOBITS: ret = 'b'; 566 } 567 } 568 569 switch (getSymbolTableIndex(symb)) { 570 case ELF::SHN_UNDEF: 571 if (ret == '?') 572 ret = 'U'; 573 break; 574 case ELF::SHN_ABS: ret = 'a'; break; 575 case ELF::SHN_COMMON: ret = 'c'; break; 576 } 577 578 switch (symb->getBinding()) { 579 case ELF::STB_GLOBAL: ret = ::toupper(ret); break; 580 case ELF::STB_WEAK: 581 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) 582 ret = 'w'; 583 else 584 if (symb->getType() == ELF::STT_OBJECT) 585 ret = 'V'; 586 else 587 ret = 'W'; 588 } 589 590 if (ret == '?' && symb->getType() == ELF::STT_SECTION) { 591 StringRef name; 592 if (error_code ec = getSymbolName(Symb, name)) 593 return ec; 594 Result = StringSwitch<char>(name) 595 .StartsWith(".debug", 'N') 596 .StartsWith(".note", 'n') 597 .Default('?'); 598 return object_error::success; 599 } 600 601 Result = ret; 602 return object_error::success; 603 } 604 605 template<support::endianness target_endianness, bool is64Bits> 606 error_code ELFObjectFile<target_endianness, is64Bits> 607 ::getSymbolType(DataRefImpl Symb, 608 SymbolRef::SymbolType &Result) const { 609 validateSymbol(Symb); 610 const Elf_Sym *symb = getSymbol(Symb); 611 612 if (getSymbolTableIndex(symb) == ELF::SHN_UNDEF) { 613 Result = SymbolRef::ST_External; 614 return object_error::success; 615 } 616 617 switch (symb->getType()) { 618 case ELF::STT_FUNC: 619 Result = SymbolRef::ST_Function; 620 break; 621 case ELF::STT_OBJECT: 622 Result = SymbolRef::ST_Data; 623 break; 624 default: 625 Result = SymbolRef::ST_Other; 626 break; 627 } 628 return object_error::success; 629 } 630 631 template<support::endianness target_endianness, bool is64Bits> 632 error_code ELFObjectFile<target_endianness, is64Bits> 633 ::isSymbolGlobal(DataRefImpl Symb, 634 bool &Result) const { 635 validateSymbol(Symb); 636 const Elf_Sym *symb = getSymbol(Symb); 637 638 Result = symb->getBinding() == ELF::STB_GLOBAL; 639 return object_error::success; 640 } 641 642 template<support::endianness target_endianness, bool is64Bits> 643 error_code ELFObjectFile<target_endianness, is64Bits> 644 ::isSymbolInternal(DataRefImpl Symb, 645 bool &Result) const { 646 validateSymbol(Symb); 647 const Elf_Sym *symb = getSymbol(Symb); 648 649 if ( symb->getType() == ELF::STT_FILE 650 || symb->getType() == ELF::STT_SECTION) 651 Result = true; 652 Result = false; 653 return object_error::success; 654 } 655 656 template<support::endianness target_endianness, bool is64Bits> 657 error_code ELFObjectFile<target_endianness, is64Bits> 658 ::getSectionNext(DataRefImpl Sec, SectionRef &Result) const { 659 const uint8_t *sec = reinterpret_cast<const uint8_t *>(Sec.p); 660 sec += Header->e_shentsize; 661 Sec.p = reinterpret_cast<intptr_t>(sec); 662 Result = SectionRef(Sec, this); 663 return object_error::success; 664 } 665 666 template<support::endianness target_endianness, bool is64Bits> 667 error_code ELFObjectFile<target_endianness, is64Bits> 668 ::getSectionName(DataRefImpl Sec, 669 StringRef &Result) const { 670 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 671 Result = StringRef(getString(dot_shstrtab_sec, sec->sh_name)); 672 return object_error::success; 673 } 674 675 template<support::endianness target_endianness, bool is64Bits> 676 error_code ELFObjectFile<target_endianness, is64Bits> 677 ::getSectionAddress(DataRefImpl Sec, 678 uint64_t &Result) const { 679 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 680 Result = sec->sh_addr; 681 return object_error::success; 682 } 683 684 template<support::endianness target_endianness, bool is64Bits> 685 error_code ELFObjectFile<target_endianness, is64Bits> 686 ::getSectionSize(DataRefImpl Sec, 687 uint64_t &Result) const { 688 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 689 Result = sec->sh_size; 690 return object_error::success; 691 } 692 693 template<support::endianness target_endianness, bool is64Bits> 694 error_code ELFObjectFile<target_endianness, is64Bits> 695 ::getSectionContents(DataRefImpl Sec, 696 StringRef &Result) const { 697 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 698 const char *start = (const char*)base() + sec->sh_offset; 699 Result = StringRef(start, sec->sh_size); 700 return object_error::success; 701 } 702 703 template<support::endianness target_endianness, bool is64Bits> 704 error_code ELFObjectFile<target_endianness, is64Bits> 705 ::getSectionAlignment(DataRefImpl Sec, 706 uint64_t &Result) const { 707 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 708 Result = sec->sh_addralign; 709 return object_error::success; 710 } 711 712 template<support::endianness target_endianness, bool is64Bits> 713 error_code ELFObjectFile<target_endianness, is64Bits> 714 ::isSectionText(DataRefImpl Sec, 715 bool &Result) const { 716 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 717 if (sec->sh_flags & ELF::SHF_EXECINSTR) 718 Result = true; 719 else 720 Result = false; 721 return object_error::success; 722 } 723 724 template<support::endianness target_endianness, bool is64Bits> 725 error_code ELFObjectFile<target_endianness, is64Bits> 726 ::isSectionData(DataRefImpl Sec, 727 bool &Result) const { 728 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 729 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) 730 && sec->sh_type == ELF::SHT_PROGBITS) 731 Result = true; 732 else 733 Result = false; 734 return object_error::success; 735 } 736 737 template<support::endianness target_endianness, bool is64Bits> 738 error_code ELFObjectFile<target_endianness, is64Bits> 739 ::isSectionBSS(DataRefImpl Sec, 740 bool &Result) const { 741 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 742 if (sec->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) 743 && sec->sh_type == ELF::SHT_NOBITS) 744 Result = true; 745 else 746 Result = false; 747 return object_error::success; 748 } 749 750 template<support::endianness target_endianness, bool is64Bits> 751 error_code ELFObjectFile<target_endianness, is64Bits> 752 ::sectionContainsSymbol(DataRefImpl Sec, 753 DataRefImpl Symb, 754 bool &Result) const { 755 // FIXME: Unimplemented. 756 Result = false; 757 return object_error::success; 758 } 759 760 template<support::endianness target_endianness, bool is64Bits> 761 relocation_iterator ELFObjectFile<target_endianness, is64Bits> 762 ::getSectionRelBegin(DataRefImpl Sec) const { 763 DataRefImpl RelData; 764 memset(&RelData, 0, sizeof(RelData)); 765 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 766 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); 767 if (sec != 0 && ittr != SectionRelocMap.end()) { 768 RelData.w.a = getSection(ittr->second[0])->sh_link; 769 RelData.w.b = ittr->second[0]; 770 RelData.w.c = 0; 771 } 772 return relocation_iterator(RelocationRef(RelData, this)); 773 } 774 775 template<support::endianness target_endianness, bool is64Bits> 776 relocation_iterator ELFObjectFile<target_endianness, is64Bits> 777 ::getSectionRelEnd(DataRefImpl Sec) const { 778 DataRefImpl RelData; 779 memset(&RelData, 0, sizeof(RelData)); 780 const Elf_Shdr *sec = reinterpret_cast<const Elf_Shdr *>(Sec.p); 781 typename RelocMap_t::const_iterator ittr = SectionRelocMap.find(sec); 782 if (sec != 0 && ittr != SectionRelocMap.end()) { 783 // Get the index of the last relocation section for this section. 784 std::size_t relocsecindex = ittr->second[ittr->second.size() - 1]; 785 const Elf_Shdr *relocsec = getSection(relocsecindex); 786 RelData.w.a = relocsec->sh_link; 787 RelData.w.b = relocsecindex; 788 RelData.w.c = relocsec->sh_size / relocsec->sh_entsize; 789 } 790 return relocation_iterator(RelocationRef(RelData, this)); 791 } 792 793 // Relocations 794 template<support::endianness target_endianness, bool is64Bits> 795 error_code ELFObjectFile<target_endianness, is64Bits> 796 ::getRelocationNext(DataRefImpl Rel, 797 RelocationRef &Result) const { 798 ++Rel.w.c; 799 const Elf_Shdr *relocsec = getSection(Rel.w.b); 800 if (Rel.w.c >= (relocsec->sh_size / relocsec->sh_entsize)) { 801 // We have reached the end of the relocations for this section. See if there 802 // is another relocation section. 803 typename RelocMap_t::mapped_type relocseclist = 804 SectionRelocMap.lookup(getSection(Rel.w.a)); 805 806 // Do a binary search for the current reloc section index (which must be 807 // present). Then get the next one. 808 typename RelocMap_t::mapped_type::const_iterator loc = 809 std::lower_bound(relocseclist.begin(), relocseclist.end(), Rel.w.b); 810 ++loc; 811 812 // If there is no next one, don't do anything. The ++Rel.w.c above sets Rel 813 // to the end iterator. 814 if (loc != relocseclist.end()) { 815 Rel.w.b = *loc; 816 Rel.w.a = 0; 817 } 818 } 819 Result = RelocationRef(Rel, this); 820 return object_error::success; 821 } 822 823 template<support::endianness target_endianness, bool is64Bits> 824 error_code ELFObjectFile<target_endianness, is64Bits> 825 ::getRelocationSymbol(DataRefImpl Rel, 826 SymbolRef &Result) const { 827 uint32_t symbolIdx; 828 const Elf_Shdr *sec = getSection(Rel.w.b); 829 switch (sec->sh_type) { 830 default : 831 report_fatal_error("Invalid section type in Rel!"); 832 case ELF::SHT_REL : { 833 symbolIdx = getRel(Rel)->getSymbol(); 834 break; 835 } 836 case ELF::SHT_RELA : { 837 symbolIdx = getRela(Rel)->getSymbol(); 838 break; 839 } 840 } 841 DataRefImpl SymbolData; 842 IndexMap_t::const_iterator it = SymbolTableSectionsIndexMap.find(sec->sh_link); 843 if (it == SymbolTableSectionsIndexMap.end()) 844 report_fatal_error("Relocation symbol table not found!"); 845 SymbolData.d.a = symbolIdx; 846 SymbolData.d.b = it->second; 847 Result = SymbolRef(SymbolData, this); 848 return object_error::success; 849 } 850 851 template<support::endianness target_endianness, bool is64Bits> 852 error_code ELFObjectFile<target_endianness, is64Bits> 853 ::getRelocationAddress(DataRefImpl Rel, 854 uint64_t &Result) const { 855 uint64_t offset; 856 const Elf_Shdr *sec = getSection(Rel.w.b); 857 switch (sec->sh_type) { 858 default : 859 report_fatal_error("Invalid section type in Rel!"); 860 case ELF::SHT_REL : { 861 offset = getRel(Rel)->r_offset; 862 break; 863 } 864 case ELF::SHT_RELA : { 865 offset = getRela(Rel)->r_offset; 866 break; 867 } 868 } 869 870 Result = offset; 871 return object_error::success; 872 } 873 874 template<support::endianness target_endianness, bool is64Bits> 875 error_code ELFObjectFile<target_endianness, is64Bits> 876 ::getRelocationType(DataRefImpl Rel, 877 uint32_t &Result) const { 878 const Elf_Shdr *sec = getSection(Rel.w.b); 879 switch (sec->sh_type) { 880 default : 881 report_fatal_error("Invalid section type in Rel!"); 882 case ELF::SHT_REL : { 883 Result = getRel(Rel)->getType(); 884 break; 885 } 886 case ELF::SHT_RELA : { 887 Result = getRela(Rel)->getType(); 888 break; 889 } 890 } 891 return object_error::success; 892 } 893 894 #define LLVM_ELF_SWITCH_RELOC_TYPE_NAME(enum) \ 895 case ELF::enum: res = #enum; break; 896 897 template<support::endianness target_endianness, bool is64Bits> 898 error_code ELFObjectFile<target_endianness, is64Bits> 899 ::getRelocationTypeName(DataRefImpl Rel, 900 SmallVectorImpl<char> &Result) const { 901 const Elf_Shdr *sec = getSection(Rel.w.b); 902 uint8_t type; 903 StringRef res; 904 switch (sec->sh_type) { 905 default : 906 return object_error::parse_failed; 907 case ELF::SHT_REL : { 908 type = getRel(Rel)->getType(); 909 break; 910 } 911 case ELF::SHT_RELA : { 912 type = getRela(Rel)->getType(); 913 break; 914 } 915 } 916 switch (Header->e_machine) { 917 case ELF::EM_X86_64: 918 switch (type) { 919 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_NONE); 920 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_64); 921 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC32); 922 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOT32); 923 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PLT32); 924 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_COPY); 925 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GLOB_DAT); 926 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_JUMP_SLOT); 927 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_RELATIVE); 928 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPCREL); 929 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32); 930 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_32S); 931 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_16); 932 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC16); 933 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_8); 934 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC8); 935 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPMOD64); 936 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF64); 937 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF64); 938 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSGD); 939 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSLD); 940 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_DTPOFF32); 941 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTTPOFF); 942 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TPOFF32); 943 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_PC64); 944 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTOFF64); 945 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32); 946 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE32); 947 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_SIZE64); 948 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_GOTPC32_TLSDESC); 949 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC_CALL); 950 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_X86_64_TLSDESC); 951 default: 952 res = "Unknown"; 953 } 954 break; 955 case ELF::EM_386: 956 switch (type) { 957 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_NONE); 958 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32); 959 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC32); 960 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOT32); 961 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PLT32); 962 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_COPY); 963 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GLOB_DAT); 964 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_JUMP_SLOT); 965 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_RELATIVE); 966 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTOFF); 967 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_GOTPC); 968 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_32PLT); 969 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF); 970 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE); 971 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTIE); 972 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE); 973 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD); 974 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM); 975 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_16); 976 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC16); 977 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_8); 978 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_PC8); 979 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_32); 980 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_PUSH); 981 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_CALL); 982 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GD_POP); 983 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_32); 984 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_PUSH); 985 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_CALL); 986 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDM_POP); 987 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LDO_32); 988 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_IE_32); 989 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_LE_32); 990 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPMOD32); 991 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DTPOFF32); 992 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_TPOFF32); 993 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_GOTDESC); 994 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC_CALL); 995 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_TLS_DESC); 996 LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_386_IRELATIVE); 997 default: 998 res = "Unknown"; 999 } 1000 break; 1001 default: 1002 res = "Unknown"; 1003 } 1004 Result.append(res.begin(), res.end()); 1005 return object_error::success; 1006 } 1007 1008 #undef LLVM_ELF_SWITCH_RELOC_TYPE_NAME 1009 1010 template<support::endianness target_endianness, bool is64Bits> 1011 error_code ELFObjectFile<target_endianness, is64Bits> 1012 ::getRelocationAdditionalInfo(DataRefImpl Rel, 1013 int64_t &Result) const { 1014 const Elf_Shdr *sec = getSection(Rel.w.b); 1015 switch (sec->sh_type) { 1016 default : 1017 report_fatal_error("Invalid section type in Rel!"); 1018 case ELF::SHT_REL : { 1019 Result = 0; 1020 return object_error::success; 1021 } 1022 case ELF::SHT_RELA : { 1023 Result = getRela(Rel)->r_addend; 1024 return object_error::success; 1025 } 1026 } 1027 } 1028 1029 template<support::endianness target_endianness, bool is64Bits> 1030 error_code ELFObjectFile<target_endianness, is64Bits> 1031 ::getRelocationValueString(DataRefImpl Rel, 1032 SmallVectorImpl<char> &Result) const { 1033 const Elf_Shdr *sec = getSection(Rel.w.b); 1034 uint8_t type; 1035 StringRef res; 1036 int64_t addend = 0; 1037 uint16_t symbol_index = 0; 1038 switch (sec->sh_type) { 1039 default : 1040 return object_error::parse_failed; 1041 case ELF::SHT_REL : { 1042 type = getRel(Rel)->getType(); 1043 symbol_index = getRel(Rel)->getSymbol(); 1044 // TODO: Read implicit addend from section data. 1045 break; 1046 } 1047 case ELF::SHT_RELA : { 1048 type = getRela(Rel)->getType(); 1049 symbol_index = getRela(Rel)->getSymbol(); 1050 addend = getRela(Rel)->r_addend; 1051 break; 1052 } 1053 } 1054 const Elf_Sym *symb = getEntry<Elf_Sym>(sec->sh_link, symbol_index); 1055 StringRef symname; 1056 if (error_code ec = getSymbolName(symb, symname)) 1057 return ec; 1058 switch (Header->e_machine) { 1059 case ELF::EM_X86_64: 1060 switch (type) { 1061 case ELF::R_X86_64_32S: 1062 res = symname; 1063 break; 1064 case ELF::R_X86_64_PC32: { 1065 std::string fmtbuf; 1066 raw_string_ostream fmt(fmtbuf); 1067 fmt << symname << (addend < 0 ? "" : "+") << addend << "-P"; 1068 fmt.flush(); 1069 Result.append(fmtbuf.begin(), fmtbuf.end()); 1070 } 1071 break; 1072 default: 1073 res = "Unknown"; 1074 } 1075 break; 1076 default: 1077 res = "Unknown"; 1078 } 1079 if (Result.empty()) 1080 Result.append(res.begin(), res.end()); 1081 return object_error::success; 1082 } 1083 1084 template<support::endianness target_endianness, bool is64Bits> 1085 ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object 1086 , error_code &ec) 1087 : ObjectFile(Binary::isELF, Object, ec) 1088 , SectionHeaderTable(0) 1089 , dot_shstrtab_sec(0) 1090 , dot_strtab_sec(0) { 1091 Header = reinterpret_cast<const Elf_Ehdr *>(base()); 1092 1093 if (Header->e_shoff == 0) 1094 return; 1095 1096 SectionHeaderTable = 1097 reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff); 1098 uint64_t SectionTableSize = getNumSections() * Header->e_shentsize; 1099 if (!( (const uint8_t *)SectionHeaderTable + SectionTableSize 1100 <= base() + Data->getBufferSize())) 1101 // FIXME: Proper error handling. 1102 report_fatal_error("Section table goes past end of file!"); 1103 1104 1105 // To find the symbol tables we walk the section table to find SHT_SYMTAB. 1106 const Elf_Shdr* SymbolTableSectionHeaderIndex = 0; 1107 const Elf_Shdr* sh = reinterpret_cast<const Elf_Shdr*>(SectionHeaderTable); 1108 for (uint64_t i = 0, e = getNumSections(); i != e; ++i) { 1109 if (sh->sh_type == ELF::SHT_SYMTAB_SHNDX) { 1110 if (SymbolTableSectionHeaderIndex) 1111 // FIXME: Proper error handling. 1112 report_fatal_error("More than one .symtab_shndx!"); 1113 SymbolTableSectionHeaderIndex = sh; 1114 } 1115 if (sh->sh_type == ELF::SHT_SYMTAB) { 1116 SymbolTableSectionsIndexMap[i] = SymbolTableSections.size(); 1117 SymbolTableSections.push_back(sh); 1118 } 1119 if (sh->sh_type == ELF::SHT_REL || sh->sh_type == ELF::SHT_RELA) { 1120 SectionRelocMap[getSection(sh->sh_link)].push_back(i); 1121 } 1122 ++sh; 1123 } 1124 1125 // Sort section relocation lists by index. 1126 for (typename RelocMap_t::iterator i = SectionRelocMap.begin(), 1127 e = SectionRelocMap.end(); i != e; ++i) { 1128 std::sort(i->second.begin(), i->second.end()); 1129 } 1130 1131 // Get string table sections. 1132 dot_shstrtab_sec = getSection(getStringTableIndex()); 1133 if (dot_shstrtab_sec) { 1134 // Verify that the last byte in the string table in a null. 1135 if (((const char*)base() + dot_shstrtab_sec->sh_offset) 1136 [dot_shstrtab_sec->sh_size - 1] != 0) 1137 // FIXME: Proper error handling. 1138 report_fatal_error("String table must end with a null terminator!"); 1139 } 1140 1141 // Merge this into the above loop. 1142 for (const char *i = reinterpret_cast<const char *>(SectionHeaderTable), 1143 *e = i + getNumSections() * Header->e_shentsize; 1144 i != e; i += Header->e_shentsize) { 1145 const Elf_Shdr *sh = reinterpret_cast<const Elf_Shdr*>(i); 1146 if (sh->sh_type == ELF::SHT_STRTAB) { 1147 StringRef SectionName(getString(dot_shstrtab_sec, sh->sh_name)); 1148 if (SectionName == ".strtab") { 1149 if (dot_strtab_sec != 0) 1150 // FIXME: Proper error handling. 1151 report_fatal_error("Already found section named .strtab!"); 1152 dot_strtab_sec = sh; 1153 const char *dot_strtab = (const char*)base() + sh->sh_offset; 1154 if (dot_strtab[sh->sh_size - 1] != 0) 1155 // FIXME: Proper error handling. 1156 report_fatal_error("String table must end with a null terminator!"); 1157 } 1158 } 1159 } 1160 1161 // Build symbol name side-mapping if there is one. 1162 if (SymbolTableSectionHeaderIndex) { 1163 const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() + 1164 SymbolTableSectionHeaderIndex->sh_offset); 1165 error_code ec; 1166 for (symbol_iterator si = begin_symbols(), 1167 se = end_symbols(); si != se; si.increment(ec)) { 1168 if (ec) 1169 report_fatal_error("Fewer extended symbol table entries than symbols!"); 1170 if (*ShndxTable != ELF::SHN_UNDEF) 1171 ExtendedSymbolTable[getSymbol(si->getRawDataRefImpl())] = *ShndxTable; 1172 ++ShndxTable; 1173 } 1174 } 1175 } 1176 1177 template<support::endianness target_endianness, bool is64Bits> 1178 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1179 ::begin_symbols() const { 1180 DataRefImpl SymbolData; 1181 memset(&SymbolData, 0, sizeof(SymbolData)); 1182 if (SymbolTableSections.size() == 0) { 1183 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1184 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1185 } else { 1186 SymbolData.d.a = 1; // The 0th symbol in ELF is fake. 1187 SymbolData.d.b = 0; 1188 } 1189 return symbol_iterator(SymbolRef(SymbolData, this)); 1190 } 1191 1192 template<support::endianness target_endianness, bool is64Bits> 1193 symbol_iterator ELFObjectFile<target_endianness, is64Bits> 1194 ::end_symbols() const { 1195 DataRefImpl SymbolData; 1196 memset(&SymbolData, 0, sizeof(SymbolData)); 1197 SymbolData.d.a = std::numeric_limits<uint32_t>::max(); 1198 SymbolData.d.b = std::numeric_limits<uint32_t>::max(); 1199 return symbol_iterator(SymbolRef(SymbolData, this)); 1200 } 1201 1202 template<support::endianness target_endianness, bool is64Bits> 1203 section_iterator ELFObjectFile<target_endianness, is64Bits> 1204 ::begin_sections() const { 1205 DataRefImpl ret; 1206 memset(&ret, 0, sizeof(DataRefImpl)); 1207 ret.p = reinterpret_cast<intptr_t>(base() + Header->e_shoff); 1208 return section_iterator(SectionRef(ret, this)); 1209 } 1210 1211 template<support::endianness target_endianness, bool is64Bits> 1212 section_iterator ELFObjectFile<target_endianness, is64Bits> 1213 ::end_sections() const { 1214 DataRefImpl ret; 1215 memset(&ret, 0, sizeof(DataRefImpl)); 1216 ret.p = reinterpret_cast<intptr_t>(base() 1217 + Header->e_shoff 1218 + (Header->e_shentsize*getNumSections())); 1219 return section_iterator(SectionRef(ret, this)); 1220 } 1221 1222 template<support::endianness target_endianness, bool is64Bits> 1223 uint8_t ELFObjectFile<target_endianness, is64Bits>::getBytesInAddress() const { 1224 return is64Bits ? 8 : 4; 1225 } 1226 1227 template<support::endianness target_endianness, bool is64Bits> 1228 StringRef ELFObjectFile<target_endianness, is64Bits> 1229 ::getFileFormatName() const { 1230 switch(Header->e_ident[ELF::EI_CLASS]) { 1231 case ELF::ELFCLASS32: 1232 switch(Header->e_machine) { 1233 case ELF::EM_386: 1234 return "ELF32-i386"; 1235 case ELF::EM_X86_64: 1236 return "ELF32-x86-64"; 1237 case ELF::EM_ARM: 1238 return "ELF32-arm"; 1239 default: 1240 return "ELF32-unknown"; 1241 } 1242 case ELF::ELFCLASS64: 1243 switch(Header->e_machine) { 1244 case ELF::EM_386: 1245 return "ELF64-i386"; 1246 case ELF::EM_X86_64: 1247 return "ELF64-x86-64"; 1248 default: 1249 return "ELF64-unknown"; 1250 } 1251 default: 1252 // FIXME: Proper error handling. 1253 report_fatal_error("Invalid ELFCLASS!"); 1254 } 1255 } 1256 1257 template<support::endianness target_endianness, bool is64Bits> 1258 unsigned ELFObjectFile<target_endianness, is64Bits>::getArch() const { 1259 switch(Header->e_machine) { 1260 case ELF::EM_386: 1261 return Triple::x86; 1262 case ELF::EM_X86_64: 1263 return Triple::x86_64; 1264 case ELF::EM_ARM: 1265 return Triple::arm; 1266 default: 1267 return Triple::UnknownArch; 1268 } 1269 } 1270 1271 template<support::endianness target_endianness, bool is64Bits> 1272 uint64_t ELFObjectFile<target_endianness, is64Bits>::getNumSections() const { 1273 if (Header->e_shnum == ELF::SHN_UNDEF) 1274 return SectionHeaderTable->sh_size; 1275 return Header->e_shnum; 1276 } 1277 1278 template<support::endianness target_endianness, bool is64Bits> 1279 uint64_t 1280 ELFObjectFile<target_endianness, is64Bits>::getStringTableIndex() const { 1281 if (Header->e_shnum == ELF::SHN_UNDEF) { 1282 if (Header->e_shstrndx == ELF::SHN_HIRESERVE) 1283 return SectionHeaderTable->sh_link; 1284 if (Header->e_shstrndx >= getNumSections()) 1285 return 0; 1286 } 1287 return Header->e_shstrndx; 1288 } 1289 1290 1291 template<support::endianness target_endianness, bool is64Bits> 1292 template<typename T> 1293 inline const T * 1294 ELFObjectFile<target_endianness, is64Bits>::getEntry(uint16_t Section, 1295 uint32_t Entry) const { 1296 return getEntry<T>(getSection(Section), Entry); 1297 } 1298 1299 template<support::endianness target_endianness, bool is64Bits> 1300 template<typename T> 1301 inline const T * 1302 ELFObjectFile<target_endianness, is64Bits>::getEntry(const Elf_Shdr * Section, 1303 uint32_t Entry) const { 1304 return reinterpret_cast<const T *>( 1305 base() 1306 + Section->sh_offset 1307 + (Entry * Section->sh_entsize)); 1308 } 1309 1310 template<support::endianness target_endianness, bool is64Bits> 1311 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Sym * 1312 ELFObjectFile<target_endianness, is64Bits>::getSymbol(DataRefImpl Symb) const { 1313 return getEntry<Elf_Sym>(SymbolTableSections[Symb.d.b], Symb.d.a); 1314 } 1315 1316 template<support::endianness target_endianness, bool is64Bits> 1317 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rel * 1318 ELFObjectFile<target_endianness, is64Bits>::getRel(DataRefImpl Rel) const { 1319 return getEntry<Elf_Rel>(Rel.w.b, Rel.w.c); 1320 } 1321 1322 template<support::endianness target_endianness, bool is64Bits> 1323 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Rela * 1324 ELFObjectFile<target_endianness, is64Bits>::getRela(DataRefImpl Rela) const { 1325 return getEntry<Elf_Rela>(Rela.w.b, Rela.w.c); 1326 } 1327 1328 template<support::endianness target_endianness, bool is64Bits> 1329 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 1330 ELFObjectFile<target_endianness, is64Bits>::getSection(DataRefImpl Symb) const { 1331 const Elf_Shdr *sec = getSection(Symb.d.b); 1332 if (sec->sh_type != ELF::SHT_SYMTAB || sec->sh_type != ELF::SHT_DYNSYM) 1333 // FIXME: Proper error handling. 1334 report_fatal_error("Invalid symbol table section!"); 1335 return sec; 1336 } 1337 1338 template<support::endianness target_endianness, bool is64Bits> 1339 const typename ELFObjectFile<target_endianness, is64Bits>::Elf_Shdr * 1340 ELFObjectFile<target_endianness, is64Bits>::getSection(uint32_t index) const { 1341 if (index == 0) 1342 return 0; 1343 if (!SectionHeaderTable || index >= getNumSections()) 1344 // FIXME: Proper error handling. 1345 report_fatal_error("Invalid section index!"); 1346 1347 return reinterpret_cast<const Elf_Shdr *>( 1348 reinterpret_cast<const char *>(SectionHeaderTable) 1349 + (index * Header->e_shentsize)); 1350 } 1351 1352 template<support::endianness target_endianness, bool is64Bits> 1353 const char *ELFObjectFile<target_endianness, is64Bits> 1354 ::getString(uint32_t section, 1355 ELF::Elf32_Word offset) const { 1356 return getString(getSection(section), offset); 1357 } 1358 1359 template<support::endianness target_endianness, bool is64Bits> 1360 const char *ELFObjectFile<target_endianness, is64Bits> 1361 ::getString(const Elf_Shdr *section, 1362 ELF::Elf32_Word offset) const { 1363 assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!"); 1364 if (offset >= section->sh_size) 1365 // FIXME: Proper error handling. 1366 report_fatal_error("Symbol name offset outside of string table!"); 1367 return (const char *)base() + section->sh_offset + offset; 1368 } 1369 1370 template<support::endianness target_endianness, bool is64Bits> 1371 error_code ELFObjectFile<target_endianness, is64Bits> 1372 ::getSymbolName(const Elf_Sym *symb, 1373 StringRef &Result) const { 1374 if (symb->st_name == 0) { 1375 const Elf_Shdr *section = getSection(symb); 1376 if (!section) 1377 Result = ""; 1378 else 1379 Result = getString(dot_shstrtab_sec, section->sh_name); 1380 return object_error::success; 1381 } 1382 1383 // Use the default symbol table name section. 1384 Result = getString(dot_strtab_sec, symb->st_name); 1385 return object_error::success; 1386 } 1387 1388 // EI_CLASS, EI_DATA. 1389 static std::pair<unsigned char, unsigned char> 1390 getElfArchType(MemoryBuffer *Object) { 1391 if (Object->getBufferSize() < ELF::EI_NIDENT) 1392 return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE); 1393 return std::make_pair( (uint8_t)Object->getBufferStart()[ELF::EI_CLASS] 1394 , (uint8_t)Object->getBufferStart()[ELF::EI_DATA]); 1395 } 1396 1397 namespace llvm { 1398 1399 ObjectFile *ObjectFile::createELFObjectFile(MemoryBuffer *Object) { 1400 std::pair<unsigned char, unsigned char> Ident = getElfArchType(Object); 1401 error_code ec; 1402 if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2LSB) 1403 return new ELFObjectFile<support::little, false>(Object, ec); 1404 else if (Ident.first == ELF::ELFCLASS32 && Ident.second == ELF::ELFDATA2MSB) 1405 return new ELFObjectFile<support::big, false>(Object, ec); 1406 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2LSB) 1407 return new ELFObjectFile<support::little, true>(Object, ec); 1408 else if (Ident.first == ELF::ELFCLASS64 && Ident.second == ELF::ELFDATA2MSB) 1409 return new ELFObjectFile<support::big, true>(Object, ec); 1410 // FIXME: Proper error handling. 1411 report_fatal_error("Not an ELF object file!"); 1412 } 1413 1414 } // end namespace llvm 1415